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THE PLANT CELL, Vol 6, Issue 9 1253-1264, Copyright © 1994 by American Society of Plant Biologists
Control of Leaf and Chloroplast Development by the Arabidopsis Gene pale cress
R. S. Reiter, S. A. Coomber, T. M. Bourett, G. E. Bartley and P. A. Scolnik
Du Pont Central Research, P.O. Box 80402, Wilmington, Delaware 19880-0402
Leaf plastids of the Arabidopsis pale cress (pac) mutant do not develop
beyond the initial stages of differentiation from proplastids or etioplasts
and contain only low levels of chlorophylls and carotenoids. Early in
development, the epidermis and mesophyll of pac leaves resemble those of
wild-type plants. In later stages, mutant leaves have enlarged
intercellular spaces, and the palisade layer of the mesophyll can no longer
be distinguished. To study the molecular basis of this phenotype, we cloned
PAC and determined that this gene is regulated by light and has the
capacity to encode an acidic, predominantly [alpha]-helical protein. The
PAC gene appears to be a novel component of a light-induced regulatory
network that controls the development of leaves and chloroplasts.
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